Microprocessor-controlled amplifier
CA 1298360 C · Owner: Telular Canada Inc. · Inventors: Shafer, James Edwin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An amplifier circuit having an FET connected in series with a resistor coupled to a constant voltage source coupled between a pair of amplifiers, such as audio amplifiers in a two-stage amplifying circuit. The FET specifically and directly determines the amount of gain of the two-stage amplifier, or the like. RDS of the FET is continually monitored by its connection to one input of an amplifier serving as a comparator, with the other input thereof serving as a reference voltage derived from a modulated signal emanating from a microprocessor. Each of the signals VDS and the reference, from the microprocessor is filtered through a low pass filter to remove the audio, or other cyclical signals …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 31, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 31, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.